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authorSergei Shtylyov <sergei.shtylyov@cogentembedded.com>2014-09-14 22:20:19 +0200
committerWolfram Sang <wsa@the-dreams.de>2014-09-29 22:41:18 +0200
commitaa5beaf62588d095398415af5d0e14c79e2478a3 (patch)
treecdf1548680ed529ab8273090a13c371dc784958e /drivers
parenti2c: rcar: make rcar_i2c_prepare_msg() *void* (diff)
downloadlinux-aa5beaf62588d095398415af5d0e14c79e2478a3.tar.xz
linux-aa5beaf62588d095398415af5d0e14c79e2478a3.zip
i2c: rcar: check for no IRQ in rcar_i2c_irq()
Check if the ICMSR register (masked with the ICMIER register) evaluates to 0 in the driver's interrupt handler and return IRQ_NONE in that case, like many other drivers do. Signed-off-by: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/i2c/busses/i2c-rcar.c8
1 files changed, 7 insertions, 1 deletions
diff --git a/drivers/i2c/busses/i2c-rcar.c b/drivers/i2c/busses/i2c-rcar.c
index c49b33e99d68..b694cba63807 100644
--- a/drivers/i2c/busses/i2c-rcar.c
+++ b/drivers/i2c/busses/i2c-rcar.c
@@ -363,6 +363,7 @@ static int rcar_i2c_irq_recv(struct rcar_i2c_priv *priv, u32 msr)
static irqreturn_t rcar_i2c_irq(int irq, void *ptr)
{
struct rcar_i2c_priv *priv = ptr;
+ irqreturn_t result = IRQ_HANDLED;
u32 msr;
/*-------------- spin lock -----------------*/
@@ -372,6 +373,10 @@ static irqreturn_t rcar_i2c_irq(int irq, void *ptr)
/* Only handle interrupts that are currently enabled */
msr &= rcar_i2c_read(priv, ICMIER);
+ if (!msr) {
+ result = IRQ_NONE;
+ goto exit;
+ }
/* Arbitration lost */
if (msr & MAL) {
@@ -406,10 +411,11 @@ out:
wake_up(&priv->wait);
}
+exit:
spin_unlock(&priv->lock);
/*-------------- spin unlock -----------------*/
- return IRQ_HANDLED;
+ return result;
}
static int rcar_i2c_master_xfer(struct i2c_adapter *adap,